org.apache.poi.ss.formula.ParseNode Maven / Gradle / Ivy
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package org.apache.poi.ss.formula;
import org.apache.poi.ss.formula.ptg.ArrayPtg;
import org.apache.poi.ss.formula.ptg.AttrPtg;
import org.apache.poi.ss.formula.ptg.FuncVarPtg;
import org.apache.poi.ss.formula.ptg.MemAreaPtg;
import org.apache.poi.ss.formula.ptg.MemFuncPtg;
import org.apache.poi.ss.formula.ptg.Ptg;
import org.apache.poi.ss.formula.function.FunctionMetadataRegistry;
/**
* Represents a syntactic element from a formula by encapsulating the corresponding Ptg
* token. Each ParseNode may have child ParseNodes in the case when the wrapped
* Ptg is non-atomic.
*
* @author Josh Micich
*/
final class ParseNode {
public static final ParseNode[] EMPTY_ARRAY = { };
private final Ptg _token;
private final ParseNode[] _children;
private boolean _isIf;
private final int _tokenCount;
public ParseNode(Ptg token, ParseNode[] children) {
if (token == null) {
throw new IllegalArgumentException("token must not be null");
}
_token = token;
_children = children;
_isIf = isIf(token);
int tokenCount = 1;
for (int i = 0; i < children.length; i++) {
tokenCount += children[i].getTokenCount();
}
if (_isIf) {
// there will be 2 or 3 extra tAttr tokens according to whether the false param is present
tokenCount += children.length;
}
_tokenCount = tokenCount;
}
public ParseNode(Ptg token) {
this(token, EMPTY_ARRAY);
}
public ParseNode(Ptg token, ParseNode child0) {
this(token, new ParseNode[] { child0, });
}
public ParseNode(Ptg token, ParseNode child0, ParseNode child1) {
this(token, new ParseNode[] { child0, child1, });
}
private int getTokenCount() {
return _tokenCount;
}
public int getEncodedSize() {
int result = _token instanceof ArrayPtg ? ArrayPtg.PLAIN_TOKEN_SIZE : _token.getSize();
for (int i = 0; i < _children.length; i++) {
result += _children[i].getEncodedSize();
}
return result;
}
/**
* Collects the array of Ptg tokens for the specified tree.
*/
public static Ptg[] toTokenArray(ParseNode rootNode) {
TokenCollector temp = new TokenCollector(rootNode.getTokenCount());
rootNode.collectPtgs(temp);
return temp.getResult();
}
private void collectPtgs(TokenCollector temp) {
if (isIf(_token)) {
collectIfPtgs(temp);
return;
}
boolean isPreFixOperator = _token instanceof MemFuncPtg || _token instanceof MemAreaPtg;
if (isPreFixOperator) {
temp.add(_token);
}
for (int i=0; i< getChildren().length; i++) {
getChildren()[i].collectPtgs(temp);
}
if (!isPreFixOperator) {
temp.add(_token);
}
}
/**
* The IF() function gets marked up with two or three tAttr tokens.
* Similar logic will be required for CHOOSE() when it is supported
*
* See excelfileformat.pdf sec 3.10.5 "tAttr (19H)
*/
private void collectIfPtgs(TokenCollector temp) {
// condition goes first
getChildren()[0].collectPtgs(temp);
// placeholder for tAttrIf
int ifAttrIndex = temp.createPlaceholder();
// true parameter
getChildren()[1].collectPtgs(temp);
// placeholder for first skip attr
int skipAfterTrueParamIndex = temp.createPlaceholder();
int trueParamSize = temp.sumTokenSizes(ifAttrIndex+1, skipAfterTrueParamIndex);
AttrPtg attrIf = AttrPtg.createIf(trueParamSize + 4); // distance to start of false parameter/tFuncVar. +4 for tAttrSkip after true
if (getChildren().length > 2) {
// false param present
// false parameter
getChildren()[2].collectPtgs(temp);
int skipAfterFalseParamIndex = temp.createPlaceholder();
int falseParamSize = temp.sumTokenSizes(skipAfterTrueParamIndex+1, skipAfterFalseParamIndex);
AttrPtg attrSkipAfterTrue = AttrPtg.createSkip(falseParamSize + 4 + 4 - 1); // 1 less than distance to end of if FuncVar(size=4). +4 for attr skip before
AttrPtg attrSkipAfterFalse = AttrPtg.createSkip(4 - 1); // 1 less than distance to end of if FuncVar(size=4).
temp.setPlaceholder(ifAttrIndex, attrIf);
temp.setPlaceholder(skipAfterTrueParamIndex, attrSkipAfterTrue);
temp.setPlaceholder(skipAfterFalseParamIndex, attrSkipAfterFalse);
} else {
// false parameter not present
AttrPtg attrSkipAfterTrue = AttrPtg.createSkip(4 - 1); // 1 less than distance to end of if FuncVar(size=4).
temp.setPlaceholder(ifAttrIndex, attrIf);
temp.setPlaceholder(skipAfterTrueParamIndex, attrSkipAfterTrue);
}
temp.add(_token);
}
private static boolean isIf(Ptg token) {
if (token instanceof FuncVarPtg) {
FuncVarPtg func = (FuncVarPtg) token;
if (FunctionMetadataRegistry.FUNCTION_NAME_IF.equals(func.getName())) {
return true;
}
}
return false;
}
public Ptg getToken() {
return _token;
}
public ParseNode[] getChildren() {
return _children;
}
private static final class TokenCollector {
private final Ptg[] _ptgs;
private int _offset;
public TokenCollector(int tokenCount) {
_ptgs = new Ptg[tokenCount];
_offset = 0;
}
public int sumTokenSizes(int fromIx, int toIx) {
int result = 0;
for (int i=fromIx; i